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Intangible Assets - Estimated Future Amortization Expense for Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Estimated future amortization expense [Abstract]    
2021 (excluding the six months ended June 30, 2021) $ 366  
2022 694  
2023 694  
2024 694  
2025 282  
Thereafter 825  
Net Carrying Amount $ 3,555 $ 3,951